The Effect of High-Energy Ball Milling Conditions on Microstructure and Hydrogen Desorption Properties of Magnesium Hydride and Single-Walled Carbon Nanotubes
Magnesium hydride is considered to be one of the most promising hydrogen storage materials, although it nevertheless has some problems, such as the high value of the activation energy of hydrogen desorption. To solve this problem, some scientists have proposed adding nanocarbon materials, in particu...
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MDPI AG
2021-09-01
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| author | Viktor N. Kudiyarov Roman R. Elman Nikita E. Kurdyumov |
| author_facet | Viktor N. Kudiyarov Roman R. Elman Nikita E. Kurdyumov |
| author_sort | Viktor N. Kudiyarov |
| collection | DOAJ |
| description | Magnesium hydride is considered to be one of the most promising hydrogen storage materials, although it nevertheless has some problems, such as the high value of the activation energy of hydrogen desorption. To solve this problem, some scientists have proposed adding nanocarbon materials, in particular carbon nanotubes, to magnesium hydride. Currently, a detailed understanding of the mechanisms of obtaining composites based on magnesium hydride and carbon nanotubes is lacking, as is our understanding of the effect of nanocarbon additives on the activation energy and temperature of hydrogen desorption depending on the parameters of the composite synthesis. In addition, the data obtained at various values of milling parameters are very different, and in some works the effect of carbon nanomaterials on the hydrogen properties of magnesium hydride was not confirmed at all. Thus, it is important to determine the effect of nanocarbon additives on the properties of hydrogen storage of magnesium hydride under various milling parameters. This work is devoted to the study of the effect of nanocarbon additives on magnesium hydride and the determination of the dependences of the hydrogen desorption temperature and activation energy on the synthesis parameters. Composite powders containing MgH<sub>2</sub> with 5 wt.% single-walled carbon nanotubes (SWCNT) were prepared using a planetary ball mill. The milling was carried out at various milling speeds, namely 300, 660, and 900 rpm. Results suggested that the structure of the nanotubes is preserved with prolonged grinding of magnesium hydride and SWCNT in a ball mill for 180 min at a relatively low grinding speed of 300 rpm. The composite obtained with these parameters has the lowest temperature of hydrogen desorption and an activation energy of H<sub>2</sub> desorption of 162 ± 1 kJ/mol H<sub>2</sub>, which is 15% lower than that of the magnesium hydride MgH<sub>2</sub> (189 ± 1 kJ/mol H<sub>2</sub>). |
| first_indexed | 2024-03-10T07:26:49Z |
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| language | English |
| last_indexed | 2024-03-10T07:26:49Z |
| publishDate | 2021-09-01 |
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| series | Metals |
| spelling | doaj.art-35dc9a4f3aa347128493d5e3e487186f2023-11-22T14:13:28ZengMDPI AGMetals2075-47012021-09-01119140910.3390/met11091409The Effect of High-Energy Ball Milling Conditions on Microstructure and Hydrogen Desorption Properties of Magnesium Hydride and Single-Walled Carbon NanotubesViktor N. Kudiyarov0Roman R. Elman1Nikita E. Kurdyumov2Division for Experimental Physics, School of Nuclear Science & Engineering, National Research Tomsk Polytechnic University, 634050 Tomsk, RussiaDivision for Experimental Physics, School of Nuclear Science & Engineering, National Research Tomsk Polytechnic University, 634050 Tomsk, RussiaDivision for Experimental Physics, School of Nuclear Science & Engineering, National Research Tomsk Polytechnic University, 634050 Tomsk, RussiaMagnesium hydride is considered to be one of the most promising hydrogen storage materials, although it nevertheless has some problems, such as the high value of the activation energy of hydrogen desorption. To solve this problem, some scientists have proposed adding nanocarbon materials, in particular carbon nanotubes, to magnesium hydride. Currently, a detailed understanding of the mechanisms of obtaining composites based on magnesium hydride and carbon nanotubes is lacking, as is our understanding of the effect of nanocarbon additives on the activation energy and temperature of hydrogen desorption depending on the parameters of the composite synthesis. In addition, the data obtained at various values of milling parameters are very different, and in some works the effect of carbon nanomaterials on the hydrogen properties of magnesium hydride was not confirmed at all. Thus, it is important to determine the effect of nanocarbon additives on the properties of hydrogen storage of magnesium hydride under various milling parameters. This work is devoted to the study of the effect of nanocarbon additives on magnesium hydride and the determination of the dependences of the hydrogen desorption temperature and activation energy on the synthesis parameters. Composite powders containing MgH<sub>2</sub> with 5 wt.% single-walled carbon nanotubes (SWCNT) were prepared using a planetary ball mill. The milling was carried out at various milling speeds, namely 300, 660, and 900 rpm. Results suggested that the structure of the nanotubes is preserved with prolonged grinding of magnesium hydride and SWCNT in a ball mill for 180 min at a relatively low grinding speed of 300 rpm. The composite obtained with these parameters has the lowest temperature of hydrogen desorption and an activation energy of H<sub>2</sub> desorption of 162 ± 1 kJ/mol H<sub>2</sub>, which is 15% lower than that of the magnesium hydride MgH<sub>2</sub> (189 ± 1 kJ/mol H<sub>2</sub>).https://www.mdpi.com/2075-4701/11/9/1409carbon nanotubesmagnesium hydridehydrogen storage materialshydrogenationcomposite materialshydrogen desorption |
| spellingShingle | Viktor N. Kudiyarov Roman R. Elman Nikita E. Kurdyumov The Effect of High-Energy Ball Milling Conditions on Microstructure and Hydrogen Desorption Properties of Magnesium Hydride and Single-Walled Carbon Nanotubes Metals carbon nanotubes magnesium hydride hydrogen storage materials hydrogenation composite materials hydrogen desorption |
| title | The Effect of High-Energy Ball Milling Conditions on Microstructure and Hydrogen Desorption Properties of Magnesium Hydride and Single-Walled Carbon Nanotubes |
| title_full | The Effect of High-Energy Ball Milling Conditions on Microstructure and Hydrogen Desorption Properties of Magnesium Hydride and Single-Walled Carbon Nanotubes |
| title_fullStr | The Effect of High-Energy Ball Milling Conditions on Microstructure and Hydrogen Desorption Properties of Magnesium Hydride and Single-Walled Carbon Nanotubes |
| title_full_unstemmed | The Effect of High-Energy Ball Milling Conditions on Microstructure and Hydrogen Desorption Properties of Magnesium Hydride and Single-Walled Carbon Nanotubes |
| title_short | The Effect of High-Energy Ball Milling Conditions on Microstructure and Hydrogen Desorption Properties of Magnesium Hydride and Single-Walled Carbon Nanotubes |
| title_sort | effect of high energy ball milling conditions on microstructure and hydrogen desorption properties of magnesium hydride and single walled carbon nanotubes |
| topic | carbon nanotubes magnesium hydride hydrogen storage materials hydrogenation composite materials hydrogen desorption |
| url | https://www.mdpi.com/2075-4701/11/9/1409 |
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